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Kim, Tae-Hyeon,Jeong, KwangSik,Park, Byung Cheol,Choi, Hyejin,Park, Sang Han,Jung, Seonghoon,Park, Jaehun,Jeong, Kwang-Ho,Kim, Jeong Won,Kim, Jae Hoon,Cho, Mann-Ho The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.2
<P>In a three-dimensional topological insulator Bi2Se3, a stress control for band gap manipulation was predicted but no systematic investigation has been performed yet due to the requirement of large external stress. We report herein on the strain-dependent results for Bi2Se3 films of various thicknesses that are grown via a self-organized ordering process. Using small angle X-ray scattering and Raman spectroscopy, the changes of d-spacings in the crystal structure and phonon vibration shifts resulted from stress are clearly observed when the film thickness is below ten quintuple layers. From the UV photoemission/inverse photoemission spectroscopy (UPS/IPES) results and ab initio calculations, significant changes of the Fermi level and band gap were observed. The deformed band structure also exhibits a Van Hove singularity at specific energies in the UV absorption experiment and ab initio calculations. Our results, including the synthesis of a strained ultrathin topological insulator, suggest a new direction for electronic and spintronic applications for the future.</P>
Numerical study on electronic and optical properties of organic light emitting diodes.
Kim, Kwangsik,Hwang, Youngwook,Won, Taeyoung American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8
<P>In this paper, we present a finite element method (FEM) study of space charge effects in organic light emitting diodes. Our model includes a Gaussian density of states to account for the energetic disorder in organic semiconductors and the Fermi-Dirac statistics to account for the charge hopping process between uncorrelated sites. The physical model cover all the key physical processes in OLEDs, namely charge injection, transport and recombination, exciton diffusion, transfer and decay as well as light coupling, and thin-film-optics. The exciton model includes generation, diffusion, and energy transfer as well as annihilation. We assumed that the light emission originates from oscillating and thus embodied as excitons and embedded in a stack of multilayer. The out-coupled emission spectrum has been numerically calculated as a function of viewing angle, polarization, and dipole orientation. We discuss the accumulation of charges at internal interfaces and their signature in the transient response as well as the electric field distribution.</P>
Route of the Korean Envoys of Chosun Dynasty and Their Cultural Legacy in Japan
Kim Kwangsik 한국박물관학회 2006 博物館學報 Vol.- No.10·11
만llS paper w피 explore the significance of the Korean diplomatic envoys to Japan in 17 - 19C. It will provide examples of cultural exchange, with particular attention to the impact on the cultural lives of both countries. The theme of this presentation is that what was ori밍nally intended for political purposes became a venue of cultural exchange that was beneficial to both countries. 8inæ time immemorial ru1ers in Korean peninsula and Japanese islets have maintained veη close relations. Most of the time, the relations were peaæ띠. It was immensely beneficial to Japan that the Korean peninsula served a rela끼ng role in transmitting advanæd continental civilization, and this trend continued until Japan φened i잉 doorto Western countries and beg.뻐 i않 modernization in late 19th æntury. From this point on, the trend reversed and western civilization was introduæd to Korea via Japan.
Kim, Hwa,Oh, Seok-Jeong,Kwak, Hui-Chan,Kim, Jong-Kyu,Lim, Cheol-Hong,Yang, Jeong-Sun,Park, Kwangsik,Kim, Sang-Kyum,Lee, Moo-Yeol Taylor Francis 2012 Journal of toxicology and environmental health. Pa Vol.75 No.24
<P>Carbon black (CB) is an industrial chemical with high potential for human exposure. Although the relationship between exposure to particulate matter (PM) and cardiovascular disease is well documented, the risk of adverse cardiovascular effects attributed to CB particles has not been clearly characterized. This study was performed to (1) investigate the effects of CB on cardiovascular system and (2) identify the target tissue or potential biomarkers. Carbon black with a distinct particle size, N330 (ultrafine particle) and N990 (fine particle), was intratracheally instilled into rats at a doses of 1, 3, or 10 mg/kg. Measurements of thrombotic activity and determination of plasma homocysteine levels, cardiac functionality, and inflammatory responses were conducted at 24-h and 1-wk time points. Exposure to N330 accelerated platelet-dependent blood clotting at 10 mg/kg, the highest exposure tested. Unexpectedly, both N330 and N990 led to prolongation of activated partial thromboplastin time (aPTT), whereas these CB particles failed to affect prothrombin time (PT). N990 produced a significant elevation in the level of plasma homocysteine, a well-established etiological factor in cardiovascular diseases. Both N330 and N990 induced apparent inflammation in the lungs; however, both particles failed to initiate systemic inflammation. Neither CB particle produced observable cardiac symptoms as detected by electrocardiography. Taken together, data show CB exposure enhanced the cardiovascular risk by inducing hyperhomocysteinemia and platelet hyperactivity, although these effects may be variable depending on particle size and exposure duration. Homocysteine may be a potential biomarker for cardiovascular toxicity following CB exposure.</P>